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In http://libvirt.org/formatdomain.html#elementsTime , we could find there are three attributes of catchup tickpolicy: limit, threshold and slew. " The catchup element has three optional attributes, each a positive integer. The attributes are threshold, slew, and limit. " The xml format likes: <clock offset='utc'> <timer name='rtc'

.... At first I thought the meanings are the same as in ntpd(1) and other time-synchonizing apps. But then I looked into the code to see what we're passing to hypervisors and it seems like since 2010, when this was added, these values were never used. [Cc-ing Laine as he is the author of commit 8bf6799b] I can't be sure though. Laine, do you recall any usage of these settings? Martin